EMFs from utility transformer

[tom baker]

Question from class today:
For a pad mount transformer, say 25 KVA, 12.5 KV primary, are there any radiated electromagnetic fields if you were sitting on the transformer? (Typical transformer with metal enclosure)

 

[brian john]

Question from class today:
For a pad mount transformer, say 25 KVA, 12.5 KV primary, are there any radiated electromagnetic fields if you were sitting on the transformer? (Typical transformer with metal enclosure)

Yes and the fields drop as you move away from the transformer.

http://www.cdc.gov/niosh/emf2.html

 

[techntrek]

True for the conductors outside of the enclosure, but the grounded case should act as a faraday cage for the transformer itself.

 

[brian john]

Get your Gauss meter out and do some readings, the case will minimize the EMF but not totally block it.

 

[nakulak]

Brian is correct. this is the difference between the theoretical faraday enclosure and the practical reality (vents + holes/gaps in enclosure = incomplete shielding)

 

[dbuckley]

Question from class today:
For a pad mount transformer, say 25 KVA, 12.5 KV primary, are there any radiated electromagnetic fields if you were sitting on the transformer? (Typical transformer with metal enclosure)

Magnetic fields, absolutely. You dont need a guass meter, just pop a CRT monitor nearby.

Back in my working for inverstment banking days we had a chuink of a trading floow we couldn't use 'cos there was a large transformer underneath the trading floor, and it played havoc with the monitors.

 

[brian john]

Magnetic fields, absolutely. You dont need a guass meter, just pop a CRT monitor nearby.

Back in my working for inverstment banking days we had a chuink of a trading floow we couldn't use 'cos there was a large transformer underneath the trading floor, and it played havoc with the monitors.

Good luck finding CRT monitors in a commercial installation these days.

 

[ptonsparky]

If I had known CRTs were test equipment...dang I just got rid of two!

 

[Speedskater]

I would not "sit" on a 12.5 KV transformer under any circumstance.

 

[catchtwentytwo]

Question from class today:
For a pad mount transformer, say 25 KVA, 12.5 KV primary, are there any radiated electromagnetic fields if you were sitting on the transformer? (Typical transformer with metal enclosure)

Wonder if this would apply to this type of transformer?

 

[dbuckley]

Good luck finding CRT monitors in a commercial installation these days.

This was a few years back...

If I had known CRTs were test equipment...dang I just got rid of two!

Never mind; theres always Craigslist